Button with random outcome?

Right, so one of the biggest problems with "The Hidden: Source" is that not many maps are dark. My map is alittle dark in some spots, but i want the hidden to be able to turn the light off.

Example: I have a hallway with 3 lights. I want a RANDOM light to go out at the press of a button. The button will have a green glow when all lights are off and a red glow when they're off.

Now, i've found the model i will be using (models/props_combine/CombineButton.mdl), and made a func_button, textured with trigger, and then parented it to the model.

Now i want to know how to

1: Make a green and red light, that will switch when pressed
2: Make a random light (or more) turn off when pressed (i'm guessing it has something to do with a logic_auto or logic_timer)
3: How to make the lights reset after a certain ammount of time.

I searched the turtorials, but it only showed me what a func_button was.

Help will be much appriciated, and you will be mentioned in the credits once i release the map

-Dr.SharK

Isn

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